#register-form {
    text-align: center;
    margin: 250px auto;
    .username {
        margin-bottom: 10px;
    }

    .password {
        margin: 5px;
    }

    .register-btn {
        margin-top: 5px;
    }

    .go-login-a {
        font-size: 12px;
    }
}